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Non-Marketable Equity Securities - Summary of Carrying Value of the Non-marketable Equity Securities (Detail) - USD ($)
$ in Thousands
5 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]    
Initial cost as of April 26, 2021 $ 1,759  
Change in fair value (645) $ (645)
Balance as of June 30, 2021 $ 1,114 $ 1,114